EP0099832B1 - Verfahren zur Videosignalverarbeitung bei einem digitalen Bildwandler und Vorrichtung um dieses Verfahren anzuwenden - Google Patents

Verfahren zur Videosignalverarbeitung bei einem digitalen Bildwandler und Vorrichtung um dieses Verfahren anzuwenden Download PDF

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Publication number
EP0099832B1
EP0099832B1 EP83401482A EP83401482A EP0099832B1 EP 0099832 B1 EP0099832 B1 EP 0099832B1 EP 83401482 A EP83401482 A EP 83401482A EP 83401482 A EP83401482 A EP 83401482A EP 0099832 B1 EP0099832 B1 EP 0099832B1
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EP
European Patent Office
Prior art keywords
radar
information
coordinates
video information
radial
Prior art date
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Expired - Lifetime
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EP83401482A
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English (en)
French (fr)
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EP0099832A1 (de
Inventor
Christian Lachaize
Jean-Pierre Andrieu
Christian Chagny
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Thales SA
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Thomson CSF SA
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/28Details of pulse systems
    • G01S7/285Receivers
    • G01S7/295Means for transforming co-ordinates or for evaluating data, e.g. using computers
    • G01S7/298Scan converters
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/04Display arrangements
    • G01S7/043Synchronising the display device with the scanning of the antenna

Definitions

  • the present invention relates to a method for processing video signals in a digital image transformer and more particularly to a processing carried out with the aim of improving the quality of the information viewed on a television monitor controlled by an image transformer.
  • This information can be radar information. It can also be information from a sonar, infrared sensors, ultrasound systems, which we want to view on screens operating in television mode.
  • the invention also relates to a device for implementing such a method.
  • image transformers first used memory tubes generally comprising two cannons, a writing cannon controlled by radar scanning and a reading cannon controlled by television scanning. Then appeared digital image transformers or TDI for "digital image transformer" which use digital circuits.
  • FIG. 1 gives a schematic representation of a digital image transformer to which the present invention applies.
  • This representation essentially comprises a circuit 1 called the radar interface circuit which receives the radar video signals VI jointly with the synchronization signals VY, a circuit 2 for converting the coordinates, p, 8, of the radar video into XY, Cartesian representation on the 'TV screen.
  • Circuits 1 and 2 are connected to a digital memory 3 with random access (RAM).
  • a so-called remanence circuit 4 is interposed between the radar interface 1 and the memory 3, which is connected to a circuit 5 said to display and read memory.
  • the television monitor 6 is connected to circuit 5.
  • the radar information displayed must have a certain quality which results in certain constraints to be respected in terms of the conversion of the coordinates and the storage. An insufficiency of this quality leads to a fluctuation of the displayed image.
  • the error in determining p is due to a shift in the phase of the video sampling clock in relation to the synchronization of the radar.
  • the error in determining the angle 8 is due to the way the start of the conversion is made. This lack of precision in determining p and 8 leads to errors in the telemetry measurements.
  • the writing of the video in the memory after conversion of the coordinates must be done so as to minimize the number of radials converted per antenna turn. Limiting the number of radials converted to the number of angle increments per revolution allows a corresponding increase in the speed of rotation of the radar antenna admissible by the image transformer.
  • the angle position error 8 is an angle increment ( ⁇ ).
  • A video point on such a card is calculated from the angle value at the time of the transmission of the synchronization pulse.
  • An angle increment error therefore results in a positioning error at the memory cell level.
  • eccentricity is meant the distance between the center of the radar given by the antenna and the center of the display screen chosen by the operator.
  • the document FR-A-2 459 486 describes a method and a device for displaying localization signals by wave reflection which comprises a single generator ensuring the control of the wave emitter and supplying the sampling signals of the signals received after reflection.
  • the subject of the invention is a method for processing video signals in a digital image transformer, as defined by claim 1, as well as are implementing device, as defined by claims 2 to 5 .
  • the writing of the video in the digital memory of the image transformer, after conversion of the coordinates, is such that it must allow a correct aging of the information entered and it is also necessary to provide means so that a turn of antenna to the next, the same memory boxes are addressed, this depending on the precision with which the distance p, or vector radius of a point in polar coordinates and its angle 8 are determined.
  • FIG. 2 schematically represents a device for implementing the method for processing video signals in a digital transformer, in accordance with the characteristics of the invention.
  • this device processes radar information.
  • Such a device for implementing the processing method according to the invention comprises an encoder 21 receiving from the input E1 the video signals VI from the associated radar, an oscillator 22, receiving from the input E2 the synchronization signals VY from the radar , an operator or processor 23 converting the polar coordinates of the radar information into coordinates Cartesian to be displayable on a television monitor screen 34.
  • This process 23 receives the following information: angle information IA, for example in the form of pulses including the North information, and the Vy radar synchro.
  • the processing device further comprises an operator 24 connected to the processor 23 and to a buffer memory 25, a video selection device 26, an operator 27 known as afterglow, a mass memory 28 and a playback device 29 of television delivering on the output S1 of the Cartesian coordinate processing device, the radar video information applied to the input in polar coordinates, information which is applied to a television monitor 34.
  • the radar video information delivered in E1 by the radar receiver is expressed in polar coordinates and is applied to the coder 21 which receives the sampling frequency which will make it possible to sample the radar video and then quantify it, in a manner known from skilled in the art.
  • This sampling frequency is delivered by an oscillator 22 controlled in phase - on the synchronization pulses Vy of the radar which are applied to the input E2 of the device.
  • This slaving which constitutes one of the characteristics of the invention, makes it possible, as has been explained previously, to eliminate the errors in distance which could be made in the determination of the distance p of a target detected by the radar.
  • such an oscillator 22 is functionally identical to the reference oscillator of the device for eliminating fixed echoes, or MTI, existing in the associated radar.
  • the polar coordinates, to Cartesian coordinates are converted for the previous radial recorded in the buffer memory 25. This conversion is carried out in the processor 23 which receives, as indicated above, the angle of rotation (IA) of the radar antenna, and the synchronization pulses Vy of the radar. In this way, the radials are converted for the value of angle of rotation defined at the time of transmission of the corresponding synchronization pulse.
  • this enslavement on the synchronization pulses of the distance sampling on the one hand and the plotting of the radials on the other hand, for the corresponding angle value makes it possible to compensate for the lack of synchronism generally existing between the emission of synchronization pulses and the rotation of the antenna in a radar, lack of synchronism which determines the lack of precision in the display and deteriorates the quality thereof.
  • This lack of synchronism can cause the situation in which two radar synchronization pulses are emitted for the same antenna angle value, thus defining two radials for this angle.
  • the operator 24, on the command of the processor 23, proceeds to combine the information carried by the two radials so that a single radial for the only defined angle value will be converted by the processor 23 with, as information, the maximum of the information of the two radials considered.
  • the buffer memory 25 therefore ensures the memorization of a radial, possibly grouped with the preceding radial (s), as well as the memorization of the preceding radial (or of the preceding grouping of radials), available to the processor 23.
  • the mass memory 28 connected to the coordinate conversion processor 23 and to the remanence operator 27, records the video levels of the different quanta of the radials corresponding to points on the screen at the given addresses. by processor 23.
  • the television reading device 29 reads the memory of mass 28 by address by the link 32, the information in Cartesian coordinates to be displayed being transmitted by the link 33.
  • the so-called television video appears on the output S1 which is connected to the television monitor 34.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Radar Systems Or Details Thereof (AREA)

Claims (5)

1. Verfahren zur Verarbeitung von Videoinformationen in einem digitalen Bildwandler, wobei die Informationen durch eine Radarentenne in Polarkoordinaten und in Form einer Folge von Radialstrahlen geliefert werden und jeder radialstrahl aus den vom Radar nach Aussenden eines Radarimpuls genannten Impulses empfangenen Bildinformationen besteht und wobei der Wandler folgende Komponenten aufweist:
- einen Analog-Digital-Wandler (21), welcher die Videoinformationen empfängt, sie abtastet und bei Empfang eines periodischen Abtastsignals in Phase mit den Radarimpulsen digitalisiert,
- einen Bildspeicher (28), welcher die digitalisierten und verarbeiteten Bildinformationen in kartesischen Koordinaten speichert und an Wiedergabemittel (34) vom Typ eines Fernsehgerätes liefert,
- Mittel (23) zur Umwandlung von Polarkoordinaten in kartesische Koordinaten, welche diskrete Informationen (IA) über die Winkelposition der Antenne und mit den Radarimpulsen synchron Synchronisierungsimpulse (Vy) empfängt und die Adressierung des Bildspeichers besorgt, und
- Mittel (27) zur Gewährleistung der Beständigkeit der im Bildspeicher gespeicherten Informationen,
dadurch gekennzeichnet, daß das Verfahren einen Schritt zur Gruppierung der Radialstrahlen aufweist, wenn sie dem gleichen Winkelpositionsinformationswert der Antenne entsprechen, daß es nach der Gruppierung einen Schritt zur Umwandlung der Koordinaten der Punkte jedes Radialstrahls aufweist, wobei als Wert der Winkelinformation jener genommen wird, der im Zweitpunkt des entsprechenden Synchronisierungsimpulses definiert ist, und daß es einen Schritt zur Erzeugung eines fiktiven Radialstrahls aufweist, der durch eine Videoinformation null gekennzeichnet ist, wenn für einen gegebenen Winkelpositionsinformationswert der Antenne kein Radialstrahl zur Verfügung steht.
2. Vorrichtung zur Durchführung des Verfahrens zur Verarbeitung von Videoinformationen in einem digitalen Bildwandler nach Anspruch 1, wobei der Wandler folgende Komponenten aufweist:
- einen Analog-Digital-Wandler (21), welcher die Videoinformationen empfängt, sie abtastet und bei Empfang eines periodischen Abtastsignals in Phase mit den Radarimpulsen digitalisiert,
- einen Bildspeicher (28), welcher die digitalisierten und verarbeiteten Bildinformationen in kartesischen Koordinaten speichert und an Wiedergabemittel (34) von Typ eines Fensehgerätes liefert,
- Mittel (23) zur Umwandlung von Polarkoordinaten in kartesische Koordinaten, welche diskrete Informationen (IA) über die Winkelposition (lA) der Antenne und mit den Radarimpulsen synchron Synchronisierungsimpulse (Vy) empfängt und die Adressierung des Bildspeichers besorgt, und
- Mittel (27) zur Gewährleistung der Beständigkeit der im Bildspeicher gespeicherten Informationen,
dadurch gekennzeichnet, daß die Vorrichtung weiter eine Operationsschaltung (24) zur Gruppierung der Radialstrahlen und eine Vorrichtung (26) zur Erzeugung eines fiktiven Radialstrahls aufweist, wobei die Operationsschaltung (24) und die Erzeugungsvorrichtung (26) von den Koordinatenumwandlungsmitteln (23) gesteuert werden.
3. Vorrichtung zur Durchführung des Verfahrens nach Anspurch 2, dadurch gekennzeichnet, daß sie einen Pufferspeicher (25) besitzt, der an den Ausgang des Gruppierungsoperators (24) angeschlossen ist und an seinen Eingang rückgeschleift ist.
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Vorrichtung (26) zur Erzeugung eines fiktiven Radialstrahls am Ausgang des Pufferspeichers (25) eingefügt ist.
5. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß sie einen autonomen Abtastfrequenzgenerator (22) besitzt, dessen Ausgang phasenmäßig gemäß den Synchronisierungsimpulsen (Vy) geregelt wird.
EP83401482A 1982-07-20 1983-07-19 Verfahren zur Videosignalverarbeitung bei einem digitalen Bildwandler und Vorrichtung um dieses Verfahren anzuwenden Expired - Lifetime EP0099832B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8212651A FR2530822B1 (fr) 1982-07-20 1982-07-20 Procede de traitement des signaux video dans un transformateur numerique d'images
FR8212651 1982-07-20

Publications (2)

Publication Number Publication Date
EP0099832A1 EP0099832A1 (de) 1984-02-01
EP0099832B1 true EP0099832B1 (de) 1990-03-14

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EP83401482A Expired - Lifetime EP0099832B1 (de) 1982-07-20 1983-07-19 Verfahren zur Videosignalverarbeitung bei einem digitalen Bildwandler und Vorrichtung um dieses Verfahren anzuwenden

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US (1) US4660043A (de)
EP (1) EP0099832B1 (de)
DE (1) DE3381321D1 (de)
FR (1) FR2530822B1 (de)

Families Citing this family (16)

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Publication number Priority date Publication date Assignee Title
GB2169465B (en) * 1984-12-11 1989-10-04 Mars G B Ltd Polar to cartesian scan conversion
FR2577681B1 (fr) * 1985-02-15 1987-09-04 Thomson Csf Procede d'extension de la gamme des frequences des recurrences radar acceptables par un transformateur numerique d'images et moyens de mise en oeuvre de ce procede
FR2579794B1 (fr) * 1985-04-02 1989-06-02 Thomson Csf Procede d'insertion et medaillons dans l'image fournie par un transformateur numerique d'images et transformateur numerique d'images mettant en oeuvre ce procede
DE3533213C1 (en) * 1985-09-18 1989-09-28 Siemens Ag Arrangement for displaying an airway corridor in the correct coordinates
EP0236177B1 (de) * 1986-01-31 1993-07-28 Thomson-Csf Verfahren zur Optimierung der Speicherung von Videosignalen in einem digitalen Bildkonverter und digitaler Bildkonverter unter Verwendung eines solchen Verfahrens
FR2593624B1 (fr) * 1986-01-31 1989-12-01 Thomson Csf Procede d'optimisation de la memorisation de signaux video dans un transformateur numerique d'images, et transformateur numerique d'images mettant en oeuvre un tel procede
FR2614994B1 (fr) * 1987-05-07 1989-06-30 Thomson Csf Procede et dispositif de visualisation de plusieurs images radar en une mosaique unique
FR2615291B1 (fr) * 1987-05-15 1989-07-13 Thomson Csf Procede de test en fonctionnement d'un dispositif de visualisation d'informations radar et mise en oeuvre de ce procede
FR2615629B1 (fr) * 1987-05-22 1990-03-02 Thomson Csf Procede d'affectation de recurrences radar a des radiales visualisables et transformateur numerique d'images mettant en oeuvre ce procede
US4954898A (en) * 1988-05-07 1990-09-04 Sony Corporation Wipe pattern generator
FR2692678B1 (fr) * 1992-06-18 1994-09-02 Sofretec Système de visualisation à distance d'informations de sortie d'au moins un radar.
FR2692679B1 (fr) * 1992-06-18 1995-01-13 Sofretec Dispositif de visualisation d'au moins une image délivrée notamment par un radar.
US7161531B1 (en) * 2003-11-04 2007-01-09 Northrop Grumman Corporation High performance radar display
CN100371734C (zh) * 2005-03-31 2008-02-27 陈华平 船用导航雷达
JP5411478B2 (ja) * 2008-10-03 2014-02-12 古野電気株式会社 レーダ装置
CN106443625B (zh) * 2016-09-19 2018-10-12 电子科技大学 基于高分辨一维像信息融合的目标识别方法

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US4002827A (en) * 1975-05-15 1977-01-11 General Electric Company Polar coordinate format to a cartesian coordinate format scan converter
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Publication number Publication date
FR2530822A1 (fr) 1984-01-27
EP0099832A1 (de) 1984-02-01
US4660043A (en) 1987-04-21
FR2530822B1 (fr) 1985-11-08
DE3381321D1 (de) 1990-04-19

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